Small, colourful and varied, nudibranchs are many a diver’s favourite subject matter. While fish swim away leaving only a fleeting image, nudibranchs allow themselves to be admired at close range, without any rush. This guide describes 80 species found around the Cape Peninsula and in False Bay, of which some are common, and some exceedingly rare. Each species receives its own page, providing information on characteristic features, distribution, habitat, and more as well as up to four photographs. These show different individuals, highlighting their variability, and include, where possible, the egg case.